192 lines
6.6 KiB
Groff
192 lines
6.6 KiB
Groff
.\" Copyright (c) 2001-2002 Maksim Yevmenkin <m_evmenkin@yahoo.com>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $Id: ng_ubt.4,v 1.3 2003/05/21 19:37:35 max Exp $
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.\" $FreeBSD$
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.\"
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.Dd June 14, 2002
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.Dt NG_UBT 4
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.Os
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.Sh NAME
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.Nm ng_ubt
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.Nd Netgraph node type that is also a driver for Bluetooth USB devices
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.Sh SYNOPSIS
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.In sys/types.h
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.In netgraph/bluetooth/include/ng_ubt.h
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.Sh DESCRIPTION
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The
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.Nm ubt
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node type is both a persistent Netgraph node type and a driver for
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Bluetooth USB devices.
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It implements a Bluetooth USB transport layer
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as per chapter H2 of the Bluetooth Specification Book v1.1.
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A new node is created when supported USB device is plugged.
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.Pp
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The node has a single hook called
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.Dv hook .
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Incoming bytes received on the device are re-assembled into HCI frames
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(according to the length).
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Full HCI frames are sent out on the hook.
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The node will add HCI frame indicator if device did not send it.
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HCI frames received on
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.Dv hook
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are transmitted out.
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The node will drop HCI frame indicator unless device
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requires it to be present.
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.Sh HOOKS
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This node type supports the following hooks:
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.Bl -tag -width indent
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.It Dv hook
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single HCI frame contained in single
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.Vt mbuf
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structure.
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.El
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.Sh CONTROL MESSAGES
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This node type supports the generic control messages, plus the following:
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.Bl -tag -width indent
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.It Dv NGM_UBT_NODE_GET_DEBUG
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Returns an integer containing the current debug level for the node.
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.It Dv NGM_UBT_NODE_SET_DEBUG
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This command takes an integer argument and sets current debug level
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for the node.
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.It Dv NGM_UBT_NODE_GET_QLEN
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This command takes a parameter that specifies queue number and returns
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current maximal length of the queue for the node.
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.It Dv NGM_UBT_NODE_SET_QLEN
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This command takes two parameters that specify queue number and maximum
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length of the queue and sets maximal length of the queue for the node.
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.It Dv NGM_UBT_NODE_GET_STAT
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Returns various statistic information for the node, such as: number of
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bytes (frames) sent, number of bytes (frames) received and number of
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input (output) errors.
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.It Dv NGM_UBT_NODE_RESET_STAT
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Reset all statistic counters to zero.
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.It Dv NGM_UBT_NODE_DEV_NODES
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This command takes single integer parameter.
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If the parameter's value is not zero, then the driver will create device nodes
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for the control, interrupt, bulk-in and bulk-out endpoints.
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If the parameter's value is zero, then the driver will destroy device nodes
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for the endpoints.
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The device nodes interface is mutually exclusive with Netgraph interface.
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.El
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.Sh DEVICE NODES INTERFACE
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The
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.Nm ubt
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driver can create or destroy endpoint device nodes on request.
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This feature can be used to implement external firmware download utility.
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.Pp
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The control transfers can only happen on the control endpoint which
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is always endpoint 0.
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Control requests are issued by
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.Xr ioctl 2
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calls.
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.Pp
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Only incoming transfers are supported on an interrupt endpoint.
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To perform I/O on an interrupt endpoint,
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.Xr read 2
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should be used.
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All I/O operations on an interrupt endpoint are unbuffered.
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.Pp
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The bulk transfers can be in or out depending on the endpoint.
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To perform I/O on a bulk endpoint,
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.Xr read 2
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and
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.Xr write 2
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should be used.
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All I/O operations on a bulk endpoint are unbuffered.
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.Pp
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The control endpoint (endpoint 0) handles the following
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.Xr ioctl 2
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calls:
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.Bl -tag -width indent
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.It Dv USB_GET_DEVICE_DESC Pq Vt usb_device_descriptor_t
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Return the device descriptor.
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.It Dv USB_GET_STRING_DESC Pq Vt "struct usb_string_desc"
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Get a string descriptor for the given language ID and string index.
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.Bd -literal
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struct usb_string_desc {
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int string_index;
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int language_id;
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usb_string_descriptor_t desc;
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};
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.Ed
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.It Dv USB_DO_REQUEST Pq Vt "struct usb_ctl_request"
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Send a USB request to the device on the control endpoint.
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Any data sent to/from the device is located at
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.Va data .
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The size of the transferred data is determined from the
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.Va request .
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The
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.Va addr
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field is ignored in this call.
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The
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.Va flags
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field can be used to flag that the request is allowed to
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be shorter than the requested size, and the
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.Va actlen
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will contain the actual size on completion.
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.Bd -literal
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struct usb_ctl_request {
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int addr;
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usb_device_request_t request;
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void *data;
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int flags;
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#define USBD_SHORT_XFER_OK 0x04 /* allow short reads */
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int actlen; /* actual length transferred */
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};
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.Ed
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This is a dangerous operation in that it can perform arbitrary operations
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on the device.
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Some of the most dangerous (e.g., changing the device address) are not allowed.
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.It Dv USB_GET_DEVICEINFO Pq Vt "struct usb_device_info"
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Get an information summary for the device.
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This call will not issue any USB transactions.
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.El
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.Sh SHUTDOWN
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This node shuts down when the corresponding USB device is un-plugged.
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.Sh BUGS
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Isochronous USB transfers are broken.
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It means that USB device will not be able to transfer SCO data (voice).
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USB interrupt transfers are implemented as bulk-in transfers (not really a bug).
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.Sh FILES
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.Bl -tag -width ".Pa /dev/ubt Ns Ar N Ns Pa \&. Ns Ar EE" -compact
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.It Pa /dev/ubt Ns Ar N Ns Pa \&. Ns Ar EE
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Endpoint
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.Ar EE
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of device
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.Ar N .
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.El
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.Sh SEE ALSO
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.Xr netgraph 4 ,
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.Xr ugen 4 ,
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.Xr usb 4 ,
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.Xr ngctl 8
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.Sh HISTORY
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The
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.Nm ubt
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node type was implemented in
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.Fx 5.0 .
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.Sh AUTHORS
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.An Maksim Yevmenkin Aq m_evmenkin@yahoo.com
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